JBR is a full-service environmental consulting firm with 140 people operating in 12 locations in western U.S. states.
Edmonton-based Stantec currently has more than 13,000 employees, including more than 5,000 in 125 offices in the United States.
It provides a range of design and consulting services for the construction industry.
Among its areas of professional expertise are planning, engineering, architecture, interior design, landscape architecture, surveying environmental secienc and project management.
Stantec said it expects the JBR deal to close in May but didn't disclose financial deals of the transaction.